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smoke!

J

Jim Isler

Member
I just put new rings and bearings in a 1943 H. Before the job it had low compression in 3 and 4, none in 1 and 2. Valves and head looked clean and OK. It ran, but without power and some smoke.

When I restarted after rings, it’s blowing a blue cloud like crazy. Rings seemed nice and tight when installed, and I honed the cylinders before putting the pistons back. Compression is now more than 60lbs (very old guage) in all cylinders, and it starts and runs smoothly except for the smoke.

Where did I go wrong?
 
How long have you run it? It will take several hours to seat the rings...

Also, the valves can look good and seal good but still have worn valve guides that will allow oil to pass.

My freshly overhauled H smoked at start up, and always has. No valve seals means a little bit of oil gets past the guides all the time. It doesn't smoke when running and warmed up, though...
 
Did you measure the sleeves with a bore gauge? My guess is a combination of new rings on worn pistons in worn sleeves, worn valve guides/valves. Take it out and work it hard to try to seat the rings, might work but probably not. Unfortunately there is no shortcut to a proper overhaul, new sleeves/rings/pistons, complete head job, new bearings, reconditioned rods ect. I've never had an engine properly overhauled smoke or burn oil on me but I am picky, no shortcuts.
 
If you had no compression on 1 and 2 then you have something else wrong besides rings. Make sure the valves are set properly. I would bet you need your head rebuilt. Your engine will never run well without your head in good shape. Best of luck to you.
 
if you honed the cylinders , did you wash them with a detergent afterwards , if not the rings are now gone.
 
You should've pushed those new rings down into the sleeves and measured the ring gap before installing them on the pistons. You probably should've installed a new sleeve kit and had the cylinder head redone by your local auto machine shop. Your piston rings need to be staggered so all the ring gaps aren't aligned with one another.

Squirt lots of oil into those cylinders and recheck the valve clearance and set them at .020" Cold. Then redo the compression test again. Hal
 
Well if the ring gaps are as they should be and off set as they should be I would say you did one of the classic mistakes of engine rebuilding. If you do the bottom do the top or the top will go bad fast. If you do the top always do the bottom or the rings will blow out the bottom. So your new rings and now showing you that you have valve problems also and the head need to be rebuilt also
Hobby farm
 
Going by what you have said. If it was mine I would make sure it has plenty of oil and coolant, set it at 1/2 throttle and let it run for about 2 hours to see if the rings burn in.
 
How long did you run it? The ports in the head and manifold and muffler have a lot of old oily carbon that is smoking as it warms up. Get it out and work it under various speeds and loads and it should clear up. Ring gaps are not that fussy as the rings travel around in the grooves anyway. If it was caused by the ring gaps it would have blowby ,not exaust smoke.
 
Are you sure you didn't put the oil wipers in upside down? Just a thought, it seems everything else was mentioned already by others.
 
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